Jamb Chemistry 1988 Past Questions and Answers

Question 36:

• JAMB 1988

What are the possible oxidation numbers of an element if its atomic number is 17?

A. -1 and 7
B. -1 and 6
C. -3 and 5
D. -2 and 6

Question 37:

• JAMB 1988

The energy changes accompanying the addition of an electron to a gaseous atom is called?

A. First ionization energy
B. Second ionization energy
C. Electron affinity
D. Electronegativity

Question 38:

• JAMB 1988

The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?

A. Nitrogen is less soluble than oxygen
B. Oxygen is heavier than nitrogen
C. Nitrogen has a higher partial pressure in air
D. Gases are hydrated in water

Question 39:

• JAMB 1988

An eruption pollution an environment with gas suspected to be H₂S, a poisonous gas. A residue team should spray the environment with?

A. Water
B. Moist SO₂
C. Acidified KMnO₄ and water
D. Water, acidified KMnO₄ and oxygen

Question 40:

• JAMB 1988

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

A. Evaporation
B. Recrystallization
C. Sublimation
D. Fractional precipitation